- New
20355 is a JR Products white plastic window and vent knob designed as a replacement for compatible RV window and vent operators. It features a 1/2-inch shaft, a 0.80-inch knob diameter and a 0.27-inch shaft length, and includes a replacement mounting screw. JR Products states that this replacement knob fits most applications. Its durable polypropylene construction makes it a practical choice for replacing a worn or damaged window or vent knob.